[PATCH 1/2] selftests/filesystems/openat2: fix O_LARGEFILE definitions for non-arm64 architectures

[Disha Goel]

The openat2_test.c code previously hardcoded O_LARGEFILE to 0x8000 on
all architectures other than arm64 (aarch64).

However, on several architectures this value is different. For example,
on PowerPC (including ppc64le), O_LARGEFILE is defined as 0x10000,
whereas 0x8000 is actually O_NOFOLLOW.

This mismatch caused the flag_validation test case to pass
O_PATH | O_NOFOLLOW instead of O_PATH | O_LARGEFILE. Since
O_PATH | O_NOFOLLOW is a valid and compatible flag combination, the
kernel successfully opened the file instead of failing with -EINVAL,
causing a false test failure on PowerPC.

Fix this by introducing proper architecture-specific definitions for
O_LARGEFILE matching their respective UAPI asm/fcntl.h values.

Signed-off-by: Disha Goel <disgoel@xxxxxxxxxxxxx>
---
 .../selftests/filesystems/openat2/openat2_test.c       | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/filesystems/openat2/openat2_test.c b/tools/testing/selftests/filesystems/openat2/openat2_test.c
index 6f5afbe2d8d3..e08c94ce0530 100644
--- a/tools/testing/selftests/filesystems/openat2/openat2_test.c
+++ b/tools/testing/selftests/filesystems/openat2/openat2_test.c
@@ -23,8 +23,16 @@
  * XXX: This is wrong on {mips, parisc, powerpc, sparc}.
  */
 #undef	O_LARGEFILE
-#ifdef __aarch64__
+#if defined(__aarch64__) || defined(__alpha__)
 #define	O_LARGEFILE 0x20000
+#elif defined(__powerpc__) || defined(__ppc__)
+#define	O_LARGEFILE 0x10000
+#elif defined(__sparc__)
+#define O_LARGEFILE 0x40000
+#elif defined(__mips__)
+#define O_LARGEFILE 0x2000
+#elif defined(__parisc__)
+#define O_LARGEFILE 0x800
 #else
 #define	O_LARGEFILE 0x8000
 #endif
-- 
2.45.1